Crafting a light block through a crafting table will yield 4 lights that default to light level 15.
Renders the light level using the new entity display while a light block is in main or off hand.
Place a light block in your off hand and look at the light you want to remove. It should get a yellow outline. Sneak and it will pop onto the ground for easy pickup.
You can modify the light level by placing the light block in the stone cutter. Levels 1-15 are accessible.
If you want, you can also spawn a villager that has trades for all the light levels. You must have cheats enabled or be op to spawn in using the function "summon_trader".

Datapack driven craft-able light blocks that can be seen and replaced while in offhand. Single-player and Multiplayer friendly.